在已有k8s云平台中误删除node节点，然后将误删除的节点添加进集群中。如果是一台新服务器必须还要安装docker和k8s基础组件。

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1.查看节点数和删除node节点（master节点）

[root@k8s01 ~]# kubectl  get nodes
NAME    STATUS   ROLES    AGE   VERSION
k8s01   Ready    master   40d   v1.15.3
k8s02   Ready       40d   v1.15.3
k8s03   Ready       40d   v1.15.3

[root@k8s01 ~]# kubectl  delete nodes k8s03
node "k8s03" deleted
[root@k8s01 ~]# kubectl  get nodes
NAME    STATUS   ROLES    AGE   VERSION
k8s01   Ready    master   40d   v1.15.3
k8s02   Ready       40d   v1.15.3
[root@k8s01 ~]#

2.在被删除的node节点清空集群信息

[root@k8s03 ~]# kubeadm reset
[reset] WARNING: Changes made to this host by 'kubeadm init' or 'kubeadm join' will be reverted.
[reset] Are you sure you want to proceed? [y/N]: y
[preflight] Running pre-flight checks
W1017 15:43:41.491522    3010 removeetcdmember.go:79] [reset] No kubeadm config, using etcd pod spec to get data directory
[reset] No etcd config found. Assuming external etcd
[reset] Please, manually reset etcd to prevent further issues
[reset] Stopping the kubelet service
[reset] Unmounting mounted directories in "/var/lib/kubelet"
[reset] Deleting contents of config directories: [/etc/kubernetes/manifests /etc/kubernetes/pki]
[reset] Deleting files: [/etc/kubernetes/admin.conf /etc/kubernetes/kubelet.conf /etc/kubernetes/bootstrap-kubelet.conf /etc/kubernetes/controller-manager.conf /etc/kubernetes/scheduler.conf]
[reset] Deleting contents of stateful directories: [/var/lib/kubelet /etc/cni/net.d /var/lib/dockershim /var/run/kubernetes]
本文题目：k8s集群删除和添加node节点-创新互联
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